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Kenya's government said a Sudanese man trained by al Qaeda was among the leaders of a raid on a Nairobi shopping mall in which at least 67 people were killed, the worst attack in the country in 15 years.

Al Qaeda-linked group al Shabaab has claimed responsibility for the assault two weeks ago on the Westgate centre, saying it was an act of revenge for Kenya's military campaign in Somalia, but the identities of the gunmen have remained unclear.

The identities of four men named by the Kenyan army as being responsible for the Westgate Mall attack were revealed on a private television station in Nairobi, which obtained and broadcast CCTV footage from the attack.

Nairobi TV station KTN named the four attackers after obtaining CCTV footage from the attack. Credit: RTV

The footage shows only four attackers, who are seen walking calming through a storeroom inside the complex, holding machine guns.

One of the men's trouser legs appears to be stained with blood, but he does not appear to be limping, which suggests it is not his.

The footage appears to contradict earlier government statements which indicated there were between 10 and 15 attackers involved in the September 21 siege.

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Two of the attackers named by a Kenyan military spokesman are known members of al-Hijra, a Kenyan extremist group affiliated with al-Shabaab, according to the former head of the United Nations Monitoring Group on Somalia.

Kenya's military spokesman has released the names of four attackers implicated in the four-day-long siege at the Westgate Mall in Nairobi. Major Emmanuel Chirchir said military intelligence had identified the attackers as: